Trapania toddi is a species of sea slug, a dorid nudibranch, a marine gastropod mollusc in the family Goniodorididae.

[2] This species was described from Loo Fu Fon, Tolo Channel, Hong Kong.

The original description also includes a single specimen from Suakin, Sudan, Red Sea.

The rhinophores, gills, oral tentacles, lateral papillae and tail are predominantly white with yellow patches below the tips.

[3] Trapania toddi feeds on Entoprocta which often grow on sponges and other living substrata.